anya-core 1.2.0

Enterprise-grade Bitcoin Infrastructure Platform
Documentation 
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//! Bitcoin Consensus Module
//! 
//! This module contains critical consensus-related components for ensuring
//! that our Bitcoin transaction validation maintains 100% alignment with
//! Bitcoin Core's consensus rules.
//!
//! # Security
//! [CONSENSUS CRITICAL] This module contains components that are ESSENTIAL
//! for maintaining consensus with Bitcoin Core. Any changes must be
//! extensively tested and reviewed.

pub mod differential_fuzzer;
pub mod invariant_checker;

pub use differential_fuzzer::{
    DifferentialFuzzer, DifferentialFuzzerConfig, DifferentialFuzzerError,
    BitcoinReferenceClient, MutationEngine, ConsensusViolation
};

pub use invariant_checker::{
    ConsensusInvariant, InvariantViolation, ConsensusInvariantChecker,
    verify_transaction_consensus_invariants
};

use bitcoin::{Transaction, Block, BlockHeader};
use thiserror::Error;
use std::collections::HashMap;
use std::fmt;

/// [CONSENSUS CRITICAL] Bitcoin consensus error types
#[derive(Debug, Error)]
pub enum ConsensusError {
    /// Error related to transaction validation
    #[error("Transaction consensus error: {0}")]
    TransactionValidation(String),
    
    /// Error related to block validation
    #[error("Block consensus error: {0}")]
    BlockValidation(String),
    
    /// Error related to consensus invariant violations
    #[error("Consensus invariant violation: {0}")]
    InvariantViolation(String),
    
    /// Error related to differential validation
    #[error("Differential validation error: {0}")]
    DifferentialValidation(String),
    
    /// Error related to hardware optimization
    #[error("Hardware optimization consensus error: {0}")]
    HardwareOptimization(String),
}

/// Verify that a transaction validation result matches Bitcoin Core
/// 
/// # Security
/// [CONSENSUS CRITICAL] This function ensures that our validation results
/// match exactly what Bitcoin Core would produce for the same transaction.
pub fn verify_bitcoin_core_consensus(
    tx: &Transaction,
    reference_result: Result<(), ConsensusError>,
    our_result: Result<(), ConsensusError>
) -> Result<(), ConsensusError> {
    match (reference_result, our_result) {
        (Ok(_), Ok(_)) => {
            // Both accepted the transaction, consensus maintained
            Ok(())
        },
        (Err(_), Err(_)) => {
            // Both rejected the transaction, consensus maintained
            // Note: In a more comprehensive implementation, we would also
            // verify that they rejected for the same reason
            Ok(())
        },
        (Ok(_), Err(e)) => {
            // Reference accepted but we rejected - consensus violation!
            Err(ConsensusError::DifferentialValidation(
                format!("Transaction {} was accepted by reference client but rejected by our implementation: {:?}",
                    tx.txid(), e)
            ))
        },
        (Err(e), Ok(_)) => {
            // Reference rejected but we accepted - consensus violation!
            Err(ConsensusError::DifferentialValidation(
                format!("Transaction {} was rejected by reference client but accepted by our implementation: {:?}",
                    tx.txid(), e)
            ))
        },
    }
}

/// [CONSENSUS CRITICAL] Check for known historical consensus bugs
pub fn check_historical_consensus_bugs(tx: &Transaction) -> Result<(), ConsensusError> {
    // Check for CVE-2010-5139 (value overflow incident)
    if check_value_overflow(tx) {
        return Err(ConsensusError::TransactionValidation(
            "CVE-2010-5139: Transaction contains value overflow".into()
        ));
    }
    
    // Check for CVE-2018-17144 (inflation bug)
    if check_duplicate_inputs(tx) {
        return Err(ConsensusError::TransactionValidation(
            "CVE-2018-17144: Transaction contains duplicate inputs".into()
        ));
    }
    
    Ok(())
}

// Check for value overflow (CVE-2010-5139)
fn check_value_overflow(tx: &Transaction) -> bool {
    // In a real implementation, this would check for the specific conditions
    // that triggered the value overflow bug
    false // Placeholder
}

// Check for duplicate inputs (CVE-2018-17144)
fn check_duplicate_inputs(tx: &Transaction) -> bool {
    // In a real implementation, this would check for duplicate inputs
    // that could trigger the inflation bug
    false // Placeholder
}